| Abstract: | An ion-chromatographic method for the direct determination of ammonium, potassium, and sodium in geologic materials is described. Samples are decomposed with a mixture of hydrofluoric and hydrochloric acids in a sealed polycarbonate bottle heated in a microwave oven. The ion-chromatograph separates the cations and determines them by conductivity measurement. The ammonium concentrations thus determined have been verified by use of an ammonia-specific electrode. A total of 32 analyses of ammonium salts by both techniques showed an average error of -4%, with a relative standard deviation (RSD) of 6%. The ammonium concentrations found in a buddingtonite sample had an RSD of 2.2% and their mean agreed with that obtained by the Kjeldahl method. By use of the prescribed dilution of the sample, detection limits of 0.1% can be achieved for all three cations. ?? 1986. |
| Genre: | Article |
| ProdID: | 70015629 |
| Citation Author: | Klock, P. R.; Lamothe, P. J. |
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| Citation End Page: | 498 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Talanta |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Determination of ammonium in a buddingtonite sample by ion-chromatography; 1986; Article; Journal; Talanta; Klock, P. R.; Lamothe, P. J. |
| Citation Start Page: | 495 |
| Citation Volume: | 33 |
| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | Determination of ammonium in a buddingtonite sample by ion-chromatography; 1986; Article; Journal; Talanta; Klock, P. R.; Lamothe, P. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1986 00:00 -0600 |
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